Merge pull request #3204 from jreback/period_py3

TST: fix for tseries/test_period for py3k

Author: jreback

pandas/tseries/tests/test_period.py

@@ -99,7 +99,7 @@ def test_period_constructor(self):
         i4 = Period('2005', freq='M')
         i5 = Period('2005', freq='m')
 
-        self.assert_(i1 != i4)
+        self.assertRaises(ValueError, i1.__ne__, i4)
         self.assertEquals(i4, i5)
 
         i1 = Period.now('Q')